title: Spatially resolved nuclear spin relaxation, electron spin relaxation and light absorption in swift heavy ion irradiated LiF crystals.
abstract: Spatially resolved (19)F and (7)Li spin-lattice relaxation rates are measured for LiF single crystals after irradiation with two kinds of swift heavy ions ((12)C of 133 MeV and (208)Pb of 1.78 GeV incident energy). Like in earlier studies on (130)Xe and (238)U irradiated LiF crystals, we found a strong enhancement of the nuclear spin-lattice relaxation rate within the ion penetration depth and a slight--but still significant--enhancement beyond. By evaluating the nuclear relaxation rate enhancement within the ion range after irradiation with different projectiles, a universal relationship between the spin-lattice relaxation rate and the dose is deduced. The results of accompanying X-band electron paramagnetic resonance relaxation measurements and optical absorption spectroscopy are included in a physical interpretation of this relationship. Also the reason for the enhanced relaxation rate beyond the ion range is further discussed.
authors.affiliation: Institut für Festkörperphysik, TU Darmstadt, Hochschulstraße 6, 64289 Darmstadt, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Stork
authors.forename: K-P
authors.initials: KP
authors.lastname: Dinse
authors.forename: M
authors.initials: M
authors.lastname: Ditter
authors.forename: F
authors.initials: F
authors.lastname: Fujara
authors.forename: W
authors.initials: W
authors.lastname: Masierak
authors.forename: R
authors.initials: R
authors.lastname: Neumann
authors.forename: B
authors.initials: B
authors.lastname: Schuster
authors.forename: K
authors.initials: K
authors.lastname: Schwartz
authors.forename: C
authors.initials: C
authors.lastname: Trautmann